A and B working separately can finish a work in 15 days and 20 days. respectively. If they work on alternate days. A starting first, and if the work goes on for 8 days, what part of the work will be left unfinished?
1
\(\frac{7}{60}\)
2
\(\frac{3}{5}\)
3
\(\frac{8}{15}\)
4
\(\frac{1}{4}\)